I don't think this is possible. I think every item can have one, and only one, crafting recipe. This is certainly true of recipes specified in .ini files; within .cs files (code), it might be possible. However, the same recipe can be used to craft multiple items.

You'll get faster, and probably better, answers to questions about mods/modding by posting in the 'Client/Server Mods + Tools' section on the forum, rather than here. Most of the active modders hang out there.